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(Reuters) - Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay.

Calbuco, considered one of the most dangerous along Chile's chain of around 2,000 volcanoes, erupted twice in 24 hours on Wednesday and Thursday, sending up a spectacular 17-km-high (11 miles) cloud and coating nearby towns in a thick layer of gray ash.

Authorities have set up a 20-km (12 mile) cordon around Calbuco, in the scenic Los Lagos region, around 1,000 km (620 miles) south of the capital Santiago, evacuating more than 6,500 locals.

"The dangerous nature of volcanic activity like this plus the volcano's current instability that could lead to more intense activity in the short term indicates we should maintain the perimeter," Chile's national office of emergency said in its latest report.

Authorities allowed people who had been evacuated to briefly enter the perimeter on Saturday to check their houses, animals and medication.

Some houses and schools located close to the volcano have collapsed under the weight of the ash.....reuters.com25/4/15

Travelers flying to and from Chile, Argentina and Uruguay on Sunday will have to sit back and wait until the sky clears out from ashes after the eruption of Chile’s Calbuco volcano...

Calbuco erupted and threw bursts of ash and lava on Wednesday and Thursday, forcing over 6,000 people living in nearby areas to evacuate.

Ash from the volcano clogged the air in the Southern Cone region of South America, causing delays and cancellations for flights to and from Argentina, Chile and even some parts of Uruguay.....http://sptnkne.ws/fTy26/4/15

The Calbuco volcano in southern Chile erupted again Thursday, releasing a large column of ash into the air just over a week after it spectacularly roared to life following half a century of inactivity.

"As predicted, the third eruptive pulse at the Calbuco volcano has arrived. Red alert," the National Geology and Mines Service wrote on its official Twitter account.AFPdailystar.com.lb30/4/15

EL Kaos UT

The UN has imposed a 2013 deadline for the submission of scientific claims to the Arctic seabed. It is the precursor to a resource boom which would see Canada, the US, Russia, Norway and Greenland all attempt to exploit the region's resources.